Abstract
A polarization-insensitive N-port optical
circulator is proposed. A four-port and a six-port circulator are assembled
and their characteristics are measured. Experiments demonstrate that the
circulators have a low insertion loss (≤1.3 dB), a high isolation level
(≥65.0 dB), and a high return loss (≥61.3 dB) for any polarization state
of input light.
© 1997 Optical Society of America
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